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Ecological stoichiometry of marine bacteria: relationship to growth rate, protozoan predation, and organic matter degradation
Descriptive
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Ecological stoichiometry of marine bacteria: relationship to growth rate, protozoan predation, and organic matter degradation
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Title
Relationship to growth rate, protozoan predation, and organic matter degradation
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Gruber
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David F.
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David F. Gruber
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Taghon
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Gary
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Gary Taghon
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chair
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Seitzinger
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Sybil
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Advisory Committee
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Sybil Seitzinger
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internal member
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Kay
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Advisory Committee
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Kay Bidle
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internal member
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Morin
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Peter
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Advisory Committee
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Peter Morin
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Rutgers University
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Graduate School - New Brunswick
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theses
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2007
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2007
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English
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electronic
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xiii, 147 pages
Abstract
The cycling of carbon between inorganic and organic compounds is an underlying process that drives all life forms. While the rates of production of organic matter have been extensively examined, the degradation rates and kinetics remain poorly understood. Microbial organisms, highly efficient recyclers, play a pivotal role in the degradation process in the ocean. This thesis explores the interactions among microbes (bacteria and protozoa) and how the competitive and predatory interactions affect the rate of organic matter degradation and regeneration. Emphasis is placed both on the structure and dynamics of the particulate and dissolved organic reservoir. Also, prey C:N:P stoichiometry is examined (both experimentally and in a model) to assess the role of elemental ratio relationships in population dynamics and organic matter cycling. It was found that under low growth rates, there is extensive variability of cell C:P and N:P, dependent on bacterial species, but at high growth rates, most species have similar C:P and N:P due to the necessity of P-rich ribosomes. Using clonal species of bacteria tagged with red and green fluorescent proteins, this thesis provides evidence that protozoan predators may prefer slower growing bacterial cells (with higher C:P and N:P), possibly because their cellular stoichiometry closer resembles that of eukaryotic consumers and less energy would need to be expended on processing the excess nutrients.
Data from this thesis suggests that the ultimate bulk percentage of carbon remineralized or respired is primarily dependent on predator/prey interactions and trophic inefficiency, regardless of the limiting nutrient. It has long been debated how the addition of protisian predators stimulates the degradation of organic matter. Here, evidence is provided that the trophic inefficiency of converting bacteria cells to protist cells may account for much of this stimulation.
Data from this thesis suggests that the ultimate bulk percentage of carbon remineralized or respired is primarily dependent on predator/prey interactions and trophic inefficiency, regardless of the limiting nutrient. It has long been debated how the addition of protisian predators stimulates the degradation of organic matter. Here, evidence is provided that the trophic inefficiency of converting bacteria cells to protist cells may account for much of this stimulation.
Note
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Ph.D.
Note
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Includes bibliographical references (p. 142-146).
Subject
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Topic
Oceanography
Subject
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Topic
Stoichiometry
Subject
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Topic
Marine bacteria--Ecology
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Graduate School - New Brunswick Electronic Theses and Dissertations
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rucore19991600001
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http://hdl.rutgers.edu/1782.2/rucore10001600001.ETD.16070
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doi:10.7282/T3FB53CN
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ETD doctoral
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David Gruber
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Rutgers University. Graduate School - New Brunswick
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I hereby grant to the Rutgers University Libraries and to my school the non-exclusive right to archive, reproduce and distribute my thesis or dissertation, in whole or in part, and/or my abstract, in whole or in part, in and from an electronic format, subject to the release date subsequently stipulated in this submittal form and approved by my school. I represent and stipulate that the thesis or dissertation and its abstract are my original work, that they do not infringe or violate any rights of others, and that I make these grants as the sole owner of the rights to my thesis or dissertation and its abstract. I represent that I have obtained written permissions, when necessary, from the owner(s) of each third party copyrighted matter to be included in my thesis or dissertation and will supply copies of such upon request by my school. I acknowledge that RU ETD and my school will not distribute my thesis or dissertation or its abstract if, in their reasonable judgment, they believe all such rights have not been secured. I acknowledge that I retain ownership rights to the copyright of my work. I also retain the right to use all or part of this thesis or dissertation in future works, such as articles or books.
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